Hey everyone I am new here and i joined because just recently I created a 5000 gallon pond in my backyard, right upon filling it with a hose it was very murky, not murky as in dirty, murky as in a bluish green color even after the dirt settled, i cant figure out what it is, it has been a few days and the murk hasnt gone down at all, I even put 5 catfish and plecos in to try to clean it up, but nothing has worked, any suggestions?